Wall-plaster.



UljITED STATES PATENT OFFICE.

WILLIAM II. ORR, OF LIMA, OHIO.

WALL-PLASTER.

SPECIFICATION forming part of Letters Patent No. 723,015, dated March 17, 1903.

Application filed October 13, 1902. Serial No. 127,179. (No specimens.

.To all whom it may concern:

Be it known that I, WILLIAM H. ORR, a citi zen of the United States, residing at Lima, in the countyofAllen and State of Ohio, have 5 invented new and useful Improvements in \Vall-Plaster,of which the following is a specification.

This invention relates to a composition of matter primarily intended as a wall-plaster;

lo and the object of the invention is to provide an inexpensive article of this character which can be easily applied to brick walls, metal or wooden lathwork, and which can be freely worked by trowels and other tools without rusting the same. The composition is light, flexible, and highly adhesive; and it consists of water-granulated furnace-slag, calcined gypsum or stucco, fire-elayfffiifini) natural cement, Portland cement, wood fiber, (dry,) and stuccb HslaYdeflandI will hereinafter set forth the proportions of the ingredients usually and preferably employed, a ton or two thousand pounds avoirdupois being adopted as a standard. I employ herein the term waterranulated as applied to the furnace-slag in order to distinguish such ingredient from handslag crushed and ground in the ordinary mannerthat is, crushed and dry ground. I take the slag just as it comes from a furnacethatis, in its hot and molten condition-and by artificial means bring it in contact wit w er, which servnsfitqlqllsll jt thggggh y, after which it is to be dried in the manner of drying sand or in any other suitable way, when it is ready for use. I have found by experiments that the water blasted or granulated slag is sharp and about forty per cent. lighter than the same bulk of sand or crushed or dry-ground slag. By water granulation the lime properties in the slag are thoroughly slaked, and the same is put into a desirable condition after it has been dried for admixture with diiferent kinds of plastic materials, such as calcine, cement, clay, &c. The water serves to thoroughly blast the slag in order to obtain fine granulation of the same.

After the slag has been reduced to the proper granulated condition it is thoroughly 5o dried, either artificially or otherwise, so as to assure its intimate association with the other ingredients of the mixture.

Adopting a ton as the standard, the proportions of the ingredients are as follows, or substantially so, as slight variations to meet different conditions may be adoptedwatergranulated furnace-sla five hundred and forty pounds; fire-clay lrefined,) three hundred pounds; na ura cement four hundred and eighty pounds; Portland cement one hundred poundscalmcco five hundred and tv eTiFmd'tls; wT ')'d'll'l') ei (dry,) sixty pounds, and stucco reta 'Iler from three to six pounds, the latter Being employed to retard the set of the plaster, and 6 the atmospheric conditions will determine the amount of stucco-retarder to be used. By retarding the set of the composition it will not crack after being put upon a wall or other backing.

The ingredients, 3.1141 are thoroughly mixed, so'as'tdproperly blend the same, and this operation can be accomplished either by hand or mechanically,and I may combine with the samea pigment or coloring-matter, so that when the plaster is placed upon a wall it will present an ornamental and painted elfect without the necessity of subsequently painting the same.

As I employ no lime in the composition, the coloring-matter stands firm. Besides this, the latter adds strength and hardness to the plaster.

The composition is placed dry with or without the coloring-matter in bags or like receptacles, so that it can be readily transported, and when ready for use it is emptied into a box or like vessel and mixed thoroughly with enough water to secure a mass that is suflieientl y plastic to be spread easily upon a wall.

My improved composition, therefore, includes in its make-up water granulated or blasted furnace-slag and a. suitable plastic material or materials and stucco-retarder. Said composition can be inexpensively and readily prepared. It is light and can be easily worked and applied.

By the term natural cement employed herein I refer to that made from natural cement-rock crushed and ground by the regu- '5 lat process, while by the term Portland 2. Acomposition of matter for wall-plaster cement I mean cement made in a different consisting of water-granulated blast-furnace 15 manner, generally from marl and limestone slag, natural cement, Portland cement, fireburned and recarbonated and treated differclay, calcined gypsum, wood fiber, stucco-re- 5 ently from the natural cement. tarder, and a pigment, in substantially the Having described the invention, what I proportions hereinbefore set forth. claim is In testimony whereof I have hereunto set 20 1. A composition of matter for wall-plaster my hand in presence of two subscribing witconsisting of water-granulated dry furnacenesses. IO slag, natural cement, PartlanLcement, fire- WILLIAM H. ORR. f claymalcjn d gypsnm, wood fibemind stucco- Witnesses:

retarder in s'fibstantially the proportions set D. J. CABLE, forth. HENRY W. NEFF. 

